Overview: The Streatham CTS (current transfer switch) project involved a multi-disciplinary design to upgrade legacy CTS equipment, alongside the associated power control equipment with modern systems, all while maintaining operational continuity. The scope required coordination between the in-house multi-discipline engineering teams, across civil, E&P, and ETE disciplines, to deliver a fully integrated design solution.
The design works included new equipment base and hardstanding area, cable routing strategy, and full renewal of the positive and negative DC cable systems. In addition, the design incorporated an extension to the existing low-voltage supply and communications cabling to ensure continued connectivity between the new equipment and the Streatham substation.
The key element of the project was the replacement of legacy CTS equipment with modern LCS equivalent, improving reliability and maintainability of the infrastructure.
Key Challenges
Difficult trackside arrangements
The proposed locations for the new LCS CTS units were situated on a steep embankment. The design considered the required delivery and installation logistics to enable an off-track construction approach, helping to reduce construction risks and support the overall programme.
Maintaining communications integrity
The communications cabling extension needed to maintain the required connectivity between the new CTS equipment and the Streatham substation. Early liaison with LCS directly ensured compatibility between the legacy communication system and the modern LCS equivalent, particularly regarding cable types and termination requirements.
Constrained cable routing
The on-track cable route was restricted due to nearby track infrastructure points layout, and the need to avoid moving parts and equipment. The new cabling also had to maintain correct cable segregation throughout. Careful routing and coordination were required to ensure compliance with railway standards while fitting within the limited available corridor.
Project Outcome
The design delivered a coordinated multi-discipline solution that enables the safe replacement of legacy CTS equipment with modern infrastructure. By addressing constructability and operational constraints early in the design process, the project supports efficient installation while maintaining system functionality and reliability.